Telephone system.



E PATENTED JUNE 12, 1906. a. R. & D. R. GREEN. TELEPHONE SYSTEM.

APPLICATION FILED AUG. 24, 1905.

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No. 823,215. PATENTED JUNE 12, 1906.

- 0. R. & D.'R. GREEN.

TELEPHONE SYSTEM.

APPLICATION FILED AUG. 24, 1905.

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CALVIN R. GREEN AND DAVID R. GREEN, OF RISING SUN, INDIANA.

TELEPHONE SYSTEM- Specification of Letters Patent Patented June 12, 1906.

.and DAVID R. GREEN, citizens of the United States, residing at Rising Sun, in the county .of Ohio and State of Indiana, have invented certain new and useful Improvements in Telephone Systems, of which the following is a specification.

This invention has relation to electric means for effecting communication between different points, such as any subscriber on a party-line telephone-circuit and central, or vice versa.

In accordance with this invention separate electromagnets are arranged in the main and party lines, the main-line electromagnet being polarized by a permanent magnet and adapted to be energized from central or eX change, either for selective or cutting of the party-line or branch into circuit, or both. The party or branch line electromagnet enables either the subscriber or the operator at central to ring off or cut the instrument out of circuit when through talking and also provides means whereby the subscriber may call central or exchange, so as to be placed in communication with the party with whom it is desired to talk.

For a full description of the invention and the merits thereof and also to acquire a knowledge of the details of construction of the means for effecting the result reference is to be had to the following description and accompanying drawings.

While the invention may be adapted to difierent forms and conditions by changes in the structure and minor details without departin from the spirit or essential features thereo, still the preferred embodiment is shown in the accompanying drawings, in

and party lines are in communication.

Figure 1 is a perspective view of an instrument embodying the invention. Fig. 2 is a .diagrammatical view showing the circuits in normal positlon.

to in the following description and indicated in all the views of the drawings by the same reference characters.

The instrument comprises a base 1, a permanent magnet 2, a multiple electromagnet 3, party-line electromagnet 4, a circuit-controller 5, and stop and trip devices cooperating with the circuit-controller and with said electromagnets. The multiple electromagnet 3 is included in the main line, and its component parts are arranged upon opposite sides of the permanent magnet 2, so as to be polarized thereby and admit of selecting the circuit according to existing conditions. The electromagnet 4 is included in the party, subscrib ers, or branch line and is utilized byboth the subscriber and central for ringing off or returning the parts to normal position. The circuit-controller 5 is normally acted upon by a force which when unrestrained imp arts movement thereto. The mechanical construction of the circuit-controller and the manner of supplying actuating force thereto are unimportant within the purview of the invention so long as said circuit-controller when released automatically moves to effect making or breaking of the circuits in the manner presently to be described. As illustrated, the circuit-controller is of circular form and receives a rotary movement, a weight 6 being the means for imparting movement thereto. The circuit-controller may have any desired form and receive movement in any direction so long as the circuits are made and broken in a way to effect the intent of this invention.

A lever 7, fulcrumed at 8 between the ele ments of the multiple electromagnet 3, is provided with armatures 9 for cooperation with the respective electromagnets. A detent-lever 10, fulcrumed between its ends to a standard 11, secured to the base 1, is provided at its outer end with a hook 12 and has its inner end underlapping the lever 7, so as to be depressed thereby when either one of the electromagnets 3 or 4 is energized. The purpose of the detent-lever 10 is to cooperate with the circuit-controller and hold it in the required position against the force normally acting thereon to effect movement thereof. Two shoulders or stops 13 are provided on the circuit-controller to be engaged by the hook 12 to positively hold the circuit-controller against the force normally tending to effect movement thereof. The circuit-controller has two lifting or cam portions 14 and 15, the portion 14 serving to move all of the shiftable contacts and the part 15 acting to move one only of said shiftable contacts, whereby either party may ring off or effect a resetting of the instrument when required.

Referring to the diagrams 2, 3, and 4, the

central or exchange is indicated at A and the subscriber at B. The main line is represented by the reference-numorals 16 and 17 the wire 16 terminating within the fixed contact 18, and the wire 17 being in electrical connection with the blade 19, carrying the movable contact 20. The branch or party line is indicated at 21 and 22, the wire 21 being in communication with the blade 23, carrying the movable contact 24, and the wire 22 being electrically connected. with the fixed contact 25. One terminal of the multiple electromagnet 3 is grounded by the wire 26, whereas the other terminal is connected by wire 27 with the fixed contact 28. One terminal of the electromagnet 4 is grounded by means of wire 29 and the other terminal is connected by wire 30 with blade 31, carrying the multiple contact 32. A lead-wire 33 connects the branch wire 22 with the fixed contact 34, and a comp anion lead-wire 35 connects the branch wire 21 with the fixed contact 36. The subscriber for each party on a circuit is provided with an instrument comprising a telephone 37, a magneto 38, and switches 39 and 40. Fig. 2 represents the normal arrangement of the parts-that is, with the movable or shiftable contacts 24, 20, and 32 electrically disconnected from the respective contacts 18, 25, and 36 and with the contacts 20 and 32 electrically connected with, respectively, the contacts 28 and 34. Suppose it be required to call central by any subscriber or party-line or branch in order to be placed in communication with the party desired to talk with. The subscriber throws switch 40 into the dotted-line position indicated in Fig. 2 or the full-line position shown in Fig. 3 and rings magneto 38. The circuit thus established is as follows: beginning at ground 41, through wire 42, to switch 40, wire 43, magneto 38, wire 44, switch 39, wire 45, line 22, wire 33, contacts 34 and 32, blade 31, wire 30, electromagnet 4, wire 29, to ground 46. On the other hand, suppose central should call a subscriber, the circuit is as follows: beginning at ground 47, through instrument 48, wire 17, blade 19, contacts 20 and 28, wire 27, electromagnet 3, wire 26, to ground 48. Upon establishing either of the aforesaid circuits the lever 7 is actuated and effects a movement of the detent-lever 10, whereby the circuit-controller 5 is released and moving forward brings the cam portion 14 in engagement with the blades 31, 19, and 23, with the resultthat the contacts 20 and 24 are caused to make electrical connection with the respective contacts 25 and 18, and the contacts 32- and 20 are electrically disconnected from the respective contacts 34 and 28. This is indi cated most clearly in Fig. The contact 32 in the initial movement of the circuit-controller, while electrically disconnected from the contact 34, does not make electrical connection with the contact 36, as indicated in Fig. 3. In the initial movement of the circuit-cont'roller the talking-circuits are established. as indicated in Fig. 3. As the circuitcontroller reaches the limit of its movement the cam portion 15 comes in contact with its blade 31 and moves it so as to bring the con tact 32 into electrical connection with the contact 36, as shown most clearly in Fig. 4, thereby enabling either party to effect a resetting of the instruments by ringing off. After the parties are through talking and it is required to return the circuit to normal position the subscriber throws the switch 39, as shown in Fig. 4, and the circuit thus established is as follows: from ground 41, through wire 42, switch 39, wire 44, magneto 38, wire 43, switch 40, wire 49, line-wire 21, wire 35, contacts 36 and 32, blade 31 wire 30, electromagnet 4, wire 29, to ground 46. Upon making the resetting-circuit the lever 7 is a second time actuated and trips the detent-lever 10 to release the circuit-controller 5, which moves a distance to complete the rotation and return to normal position. Suppose central or exchange should ring off.

In this event the circuit would be as follows:

from ground through wire 16, contacts 18 and 24, blade 23, wire 21, wire 35, contacts 36 and 32, blade 31, wire 30, electromagnet 4, wire 29 ,jto ground 46.

In the practical operation of the invention each subscriber of a party-line is provided with an instrument constructed substantially as herein set forth, thereby enabling the 0 erator at central to call any subscriber without attracting attention of others on the same line and at the same time providing means whereby any subscriber may call central, so as to be placed in communication with any other party in the same circuit or 011 a different line with whom communication is desired to be had. In the installation of a system of telephoning in accordance with this invention each party included in a circuit is provided with an instrument substantially as herein disclosed, the same being con nected so as to provide the several circuits whereby the different operations specifically recited may be attained.

Having thus described the invention, what is claimed as new is v 1. In a telephone system, the combination of main and party lines, an electromagnet included in the main line, a separate electromagnet arranged to be included in either the main or the party line, a series of circuitclosers, a circuit-controller normally acted upon by a force, a detent for normally holding said circuit-controller in restraint against the force normally tending to move the same, an electrically-controlled releasing mechanism for liberating the circuit-controller to permit automatic actuation thereof, substantially as set forth.

2. In a telephone system, the combination IIO of main and party lines, circuit-closers therefor including a series of fixed and movable contacts, a circuit-controller for the movable contacts constructed to break certain circuits and to establish certain other circuits, means normally tending to move said circuit-controller, restraining means therefor, and separate electromagnets included in the main and party lines to be ener ized to effect release of the circuit-controller cm the restraining device, substantially as specified.

3. In combination, main and party lines, a series of circuit-closers therefor comprising fixed and movable contacts, a circuit-con troller normally acted upon by a force and comprising differential lifts or cam portions to effect unequal movement of the shiftable contacts, means for normally holding the circuit-controller in restraint, and an electrically-controlled releasing mechanism to effect liberation of said circuit-controller, substantially as specified.

4. In combination, main and party lines, circuit-closers therefor comprising fixed and movable contacts, a circu1t-controller normally acted upon by a force and having differential cam portions or lifts and provided with corresponding stops, a detent cooperating with said stops to hold the circuit-controller in the predetermined position, and an electrically-controlled releasing mechanism to effect liberation of said detent-lever to permit establishing of the circuits and a resetting of the several parts in one complete movement of said circuitcontroller.

5. In combination, main and party lines, a mulitple electromagnet included in one line, a separate electromagnet adapted to be included in either of the lines, a circuit-controlling mechanism for throwing the circuits into and out of action, and a permanent magnet arranged between the members of the multiple electromagnet for polarizing the same to admit of selection being made when it is required to cut one of a series of circuits into the main circuit.

In testimony whereof we affix our signatures in presence of two Witnesses.

CALVIN R. GREEN. DAVID R. GREEN. 

